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Explain how turgor pressure in a guard cell helps during photosynthesis?


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February 21, 2008 9:53AM

Turgor pressure can cause a guard cell to close or open. As the guard cells take in water, it becomes turgid, causing the guard cells to bow, causing the stoma to open. By allowing the stoma to open, gases are able to enter. This is important because since gas rises, it allows CO2 to be captured, which is an important source for photosynthesis. It also allows gas exchange; a product of photosynthesis is oxygen, which then is allowed to be released into the environment through that opening. However, this causes water to be released, which is also an important resource for the photosynthesis.

On the other hand, if the cells become flaccid, there is less pressure on the guard cells, causing the stoma to close. This allows the plant to conserve its water and carbon dioxide.